The story opens with Lou, sitting in her car parked in her garage, shakily replaying an accident she had on her way home from her job in Paris. She was driving cautiously through the Pont de l’Alma tunnel when a vehicle came up quite suddenly behind her, striking her and then ricocheting into the tunnel wall. Lou speeds home, shaken up and not thinking rationally. After all, the accident wasn’t her fault.

The next morning, Lou listens to the radio and understands the occupants of the car were none other than Princess Di, her companion Dodi, their bodyguard, and chauffer. From that moment on, Lou is panicked, knowing she should go to the authorities, yet desperate to avoid the scrutiny she knows will come, and her actions, though seemingly well-thought-out and rational, bring her ever closer to the brink of ruin.